Crawling but not sitting?

Tootermi

Anyone else's babe crawling but not sitting alone yet? DD refuses to sit up by herself. She will sit up briefly supporting herself with her hand but tumbles over and starts rolling or crawling right away. 

Audtee

DS does the same thing. He can sit, but he's just completely uninterested. I've never even seen him sit himself up. He crawls all over the place and tries to pull himself up to standing from a crawling position. He's really strong and is pretty close to doing it. It is the funniest thing to watch. If we sit him up, he can easily pull up to standing, but he just refuses to sit on his own.

IgnatusDem

DS was the same way for a while.  He was just more interested in moving around.  He got the hang of it once he could go from crawling to sitting.  Now he's climbing on stuff -_- God help us.